1 /* Examine __jmp_buf for unwinding frames.
2 Copyright (C) 2022-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
23 #include <pointer_guard.h>
25 /* Test if longjmp to JMPBUF would unwind the frame
26 containing a local variable at ADDRESS. */
27 #define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
28 ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
30 #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
31 _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
33 static inline uintptr_t __attribute__ ((unused
)) _jmpbuf_sp (__jmp_buf regs
)
35 uintptr_t sp
= regs
[0].__sp
;
40 #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
41 ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
43 /* We use the normal longjmp for unwinding. */
44 #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)